Unsafe Attic Temperatures

To head off these problems consider these options for bringing your attic s temperature down.

Unsafe attic temperatures.

Alternatively install passive vents such as gable soffit and ridge vents which. In some cases attic temperatures can reach above the 150 degree mark. If this isn t bad enough add to it the fact that an attic can reach temperatures of 120 degrees on a hot summer day. High temperatures inside your attic shorten the life span of shingles.

See webb site address above for full text. They have done much of their testing in las vegas and phoenix where conditions are the worst and 150 degree attic temperatures are common. They have thermostats that turn the fan. Excessive heat deteriorates items you store in the attic and can cause moisture problems in your house.

Install electric ventilators and attic fans which remove hot air from an attic. These images came from a presentation danny parker gave pdf on fsec s cool roof research the third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic. I have to go into attics all the time and believe me i don t look forward to it. The white roof lowered the attic temperature by about 20 f.

Field monitoring of numerous attics has confirmed that the temperature of the roof sheathing of a unvented roof will rise by a few to no more than 10 f more than a well ventilated attic. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures. What should the attic temperature be relative to the outside and house temperatures assuming a new supposedly well insulated house. If your attic is not properly ventilated your cooling costs will not be as low as they should be because your system is constantly running to compensate for the excess heat.

It s also been found that roofing design and materials have more effect on attic temperature than ventilation.